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i am looking for a set up that can control 23 t-stats 10 are for air handlers with fan coil the other 13 are for radient floor system the homeowner wants 1 control that can shut down all stats to a preset vaction setting? thanks

If the customer wants to control the temperatures you could have a 1 plc built using 23 analog thermostats, this would eliminate the others, making this 1 maint stat smaller, and controllable. You can add all kinds of cool toys to it like a touchscreen programmable display for the customer to make changes and adjustments. Depends on how much $$$.